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    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
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    <title>JavaScript 对象是易变的</title>
</head>

<body>
    <h1>JavaScript 对象是易变的</h1>

    <p>对对象副本的任何更改也将更改原始对象。</p>

    <p id="demo"></p>

    <script>
        var person = { firstName: "Bill", lastName: "Gates", age: 62, eyeColor: "blue" }

        var x = person;
        x.age = 10;

        document.getElementById("demo").innerHTML =
            person.firstName + " is " + person.age + " years old.";
    </script>
</body>

</html>